Building a Ray Tracer - Page Three

For simplicity, all scenes are described in screen coordinates. The view plane coincides with the screen plane and the view window goes from (0, 0, 0) in the upper left to (433, 453, 0) in the lower right. The objects (all spheres in these first pictures) are placed between the screen and the viewer. The direction from the screen toward the viewer is the positive z-axis.